Coupling for pipes, &amp;c.



N0. 70!,0I9. Patented May 27, I902.

S. E. DIESCHER.

COUPLING FOR PIPES, 8w.

(Application filed Oct. 21, 1901.}

(No Model.)

m: "cams wsrzns co. PHOTO-UTRQ, \VASHINGYON u c hrnrns Fitment fiss on.

SAMUEL E. DIESCIIER, OF PITTSB'URG, PENNSYLVANIA.

COUPUNG FOR PIPES, 3pc.

SPECIFIGATEON forming part of Letters Patent No. 701,019, dated May 27,1902. Application filed October 21, 1901. Serial Ilo. 79, l07. (ll'omodel.)

' Pennsylvania, have invented or discovered certain new and usefulImprovements in Couplings for Pipes, &c., of which improvements thefollowing is a specification.

The invention described herein relates to certain improvements incouplings of the class or type forming the subjects-matter of LettersPatent Nos. 631,956 and 631,957, dated August 29, 1899, and consisting,generally stated, in gripping coils and an inclosing case or shell.

two coils 1, having oppositepitches and l1avin g an internal diameterapproximately equal to the external diameter of the pipe-sections 2 tobe connected. The coils have their outer surfaces tapering from theouter to their innor ends, corresponding to the internal taper of theinclosing case or shell 3. The coils are externally threaded, thethreads on each coil having-a pitch opposite the pitch of the coilsthemselves, and the case or shell is internally threaded, the pitch ofthe threads at one end right-handed and at the opposite end left handed.

In making a connection between pipe-sections the coils are slipped ontothe ends of the pi pe-sections,wl1ich they should fit snugly bypreference. The ends of the coils and pipes are then inserted into theends of the case or shell and the latter rotated, so as to draw thecoils and pipe ends into the case or shell. While the case or shell isrotated on the coils the latter and the pipe'scctions are ployed forholding the pipe-sections.

The present invention has for its object a held stationary. This can beconveniently effected by forming lugs 4 on the outer or larger ends ofthe coils, said lugs being adaptedto engage the pipetongs or other toolem As the threads on the coils have a pitch opposite that of the pitchof the coils, it is obvious that in turning the case or shell in thedirection of the arrow at to screw it onto the coils the case or shellwill have a tendency to pull with it the front or inner ends of thecoils as soon as it is in frictional engagement with such ends, andthereby tighten the coils onto the pipesections. The tighteningof thecoils is also effected by the circumferential. pressure applied to thecoils as they pass into the case or shell. As the coils are made to fitthe pipe snugly, only a partial turn of the case or shell will be neededto cause the coils to take a firm grip on the pipe-section, so that bythe continued rotation of the case or shell the ends of thepipe-sections will be drawn toward each other and against a suitablepacking-ring 5, interposed between the adjacent ends of thepipe-sections. In order to prevent the pack ing from being squeezed outinto the space between the case or'shell and the pipe-sections, abacking or reinforcement (5 for the packing-ring is provided. As shownin Fig. 1, the backing or reinforcement may be formed integral with thepacking-ring or may be formed in or secured to the case or shell, asshown at 6 in Fig. 3. In the latter case the backing or reinforcement isprovided with a groove to hold the packing in position.

As shown in Fig. 2, my improved coupling canbe employed for connectingthe adjacent ends of shafts 7. The construction and mannor of applyingthe coupling to shafts is simi-a lar to that described except that nopacking is employed.

While the construction shown in Figs. 1 and 2 is efficient as regardsits coupling or connecting function, difficulty is experienced in Iuncoupling, especially when the parts have been brought togethertightly, for the reason that in turning the caseor shell oack there willbe a tendency on the part of the case or shell to push back the innerends of the coils and to cause an expansion thereof against the case orshell and to prevent the latter turning back on the coils. Thisobjectiom able feature can, however, be obviated by making the threadson the coils with a pitch v inthe same direction as that of the coilsthemselves, as shown in Fig. 3. When the case or shell is screwed ontothe coils, there will be a tendency to push the front or inner endsof'the coils back or in a direction. to enlarge the coils. In order toprevent any such back or enlarging movement of the inner ends of thecoils, they are made of such internal diameter that theinner coils willgrip the inner ends of the pipe-sections firmly when pushed into thecoils. This frictional grip will be sufiicient ordinarily to hold thecoils on the pipes, but may be rendered more certain by roughening theinternal surfaces of the inner ends of the coils. When the inner ends ofthe coils are thus held, the coils will be caused to grip thepipe-sections by the circumferential pressure of the case or shell, theouter ends of the coils being forward; This forward movement of thecoils around will be assisted by the friction between the coils and thecase or shell. It is found in practice that in this construction thegrip on the pipes is as elfectual as in the construction shown in Figs.1 and 2 and that the joint thus formed can be loosened by turning thecase or shell back, there being no gripping of the coils against thecase orshell during such back movement.

I claim herein as my invention- 1. A coupling for pipes, 850., having incombination two coils externally tapered and threaded and a case orshell internally iapered in opposite directions and threaded tocorrespond to the threads on the coils, substantially as set forth.

2. A coupling for pipes, 850., havingin combination two coils ofopposite pitch externally tapered and having external right and leftthreads and a case or shell internally tapering in opposite directionsand internally threaded to correspond with the threads on the coils,substantially as set forth.

3. A coupling for pipes, &c., having in combination two coils ofopposite pitch externally tapered, and having external right and leftthreads, means for locking one end of each coil to the pipe, 850., and acase or shell internally tapering, in opposite directions and internallythreaded to correspond to the threads on the coils, substantially as setforth.

4. A coupling for pipes, the. having in combination two coils ofopposite pitch externally tapered and having external threads pitched inthe same direction as the coils and a case or shell internally taperingin opposite directions and threaded to correspond with the threads onthe coils, substantially as set forth.

In testimony whereof I have hereunto set my hand.

SAMUEL E. DIESGIIER.

Witnesses:

DAR'WIN S. WoLoorT, F. E. GAITHER.

